Final Exam Practice Questions Flashcards
Acids:
release protons(H+) when dissolved in water
Suzy puts some glucose(C6H12O6) into a container of water. What happens to the glucose?
Each individual glucose molecule is surrounded by water molecules.
Proteins:
are a polymer held together by peptide bonds
Which of the following do the work in living tissue and cell?
proteins
What molecules are required for cells to produce ATP?
oxygen and glucose
How many molecules of glucose are in 1 mole?
6.02x10^23
Which weighs more?
-One mole of glucose
-one mole of ethanol
-they weight the same
-can’t tell from data given
one mole of glucose
Susy has a solution with a concentration of hydrogen ions [H+] = 10^-3. The pH of the solution is
3
Susy has a solution with a concentration of hydrogen ions: [H+] = 10^-3. This solution is:
acidic
A cell needs to keep sodium (Na+) outside the plasma membrane. Even though the concentration of Na+ is higher outside than inside the cell, the cell keeps pumping Na+ out through an Na+-specific channel. This is an example of:
active membrane potential
Which layer of the epidermis is characterized by a high rate of mitosis and the presence of stem cells?
stratum basale
Parathyroid hormone (PTH) plays a major role in raising blood calcium (Ca++) levels through a negative feedback loop. Which of the following best describes how PTH works?
As Ca++ levels go down, PTH rises. This raises Ca++ levels.
The occipital bone of the skull meets the parietal bone at
the lambdoid suture
Hyaluronic acid is secreted by Type B cells of the synovial membrane, and increases the viscosity of synovial fluid. It may be useful for treating:
osteoarthritis
Which of the following binds calcium during actin/myosin contraction?
troponin
What is the chemical signal that communicates across the synaptic cleft at the neuromuscular junction?
acetylcholine
How is an action potential transmitted from the sarcolemma to the sarcoplasmic reticulum?
t tubules
Which of the following occurs first in contraction of skeletal muscle:
motor neuron action potential
Curare is a plant-derived poison, traditionally used by indigenous people of South America for arrows and blowguns. When injected, curare reversibly prevents acetylcholine from binding to its receptor at the sarcolemma.
This will:
prevent muscle contraction
Which of the following muscles elevates the ribs for inspiration/inhalation?
external intercostals
How do neurotransmitters exert an effect on the postsynaptic neuron?
-binding a receptor at the postsynaptic neuron
-initiating a graded potential
The threshold for initiating an action potential is -55mV. Why?
voltage gated sodium channels open
A neuron binds neurotransmitters at three different dendrites that cause graded potentials of +10, -15, and
-20 mV. Will the neuron initiate an action potential?
No
Susy is working on a difficult calculus problem. Reading the problem provides afferent visual information. Where is the integration center for her response?
the cerebral cortex
CNS damage causing blindness would most likely involve injury to:
the occipital lobe of the cerebrum
The the light, which of the following happens in the retina?
-trans-retinal is produced
-action potentials at the ganglion cells
